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Magic Plastics 0121109015 1.5" FBT Small Flange Pump Union Split Nut This is a hex nutMagic Plastics 0121109015 1. 5" FBT Small Flange Pump Union Split Nut Specifications: Heater Union Part Type: Split Nut Small Flange Union Fitting Type: Split Nut Small Flange Union Fitting Application: Pump 1 1 2" Plumbing Connection Size "A": 1 1 2", 2 3 16" Plumbing Connection Type "A": Female Buttress Thread (fbt), Small Flange (For Pump Unions) Plumbing Connection Size "B": 2", 2 3 16" Plumbing Connection Type "B": Female Buttress Thread (fbt),